Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Phosphorous Removal by Al(III) and Fe(III) Coagulants and Visualization of Flocs

Al(III), Fe(III)계 응집제의 인 제거 특성 및 플럭의 가시화

  • Lee, Sang-Wha (Department of Chemical & Bio Engineering, Kyungwon University) ;
  • Lee, Ku-Suk (Department of Chemical & Bio Engineering, Kyungwon University) ;
  • Kang, Ik-Joong (Department of Chemical & Bio Engineering, Kyungwon University) ;
  • Yoon, Hyon-Hee (Department of Chemical & Bio Engineering, Kyungwon University) ;
  • Haam, Seung-Joo (Department of Chemical Engineering, Yeonsei University) ;
  • Kwak, Jong-Woon (Econovel Co., Ltd.)
  • 이상화 (경원대학교 화학생명공학과) ;
  • 이규석 (경원대학교 화학생명공학과) ;
  • 강익중 (경원대학교 화학생명공학과) ;
  • 윤현희 (경원대학교 화학생명공학과) ;
  • 함승주 (연세대학교 화학공학과) ;
  • 곽종운 ((주)에코노벨 기술연구소)
  • Received : 2004.07.23
  • Accepted : 2004.11.02
  • Published : 2005.02.10
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Abstract

The effective removal of turbid-inducing particulates and algae-inducing phosphorous was systematically investigated by the variation of physico-chemical parameters such as pH, alkalinity, and coagulant types. Al(III)-based and Fe(III)-based coagulants exhibited high removal efficiency of turbidity and phosphorous at optimal pH ranges of 7~9, in which zeta potential nearly approached to zero. The removal rate of turbidity rapidly increased with the increase of coagulant dosages, whereas the removal rate of phosphorous gradually increased due to an equivalent reaction of phosphorous with metallic ions. The generation of flocs during coagulation was visualized by high speed camera (Motion Scope 2000, Redlake Co.), and the images of singular flocs were captured by optical microscope. The flocs generated by Fe(III)-based coagulant was more compact than those induced by Al(III)-based coagulant, and the settlabiltiy of Fe(III)-induced flocs was superior to that of Al(III)-induced flocs.

탁질입자 및 인의 효과적인 제거 특성을 고찰하기 위해서 물리화학적 인자들(pH, 알칼리도, 응집제의 종류)의 체계적인 고찰을 수행하였다. AI(III)과 Fe(III)계 응집제들은 제타전위 값이 거의 영에 수렴하는 pH 7~9 영역에서 높은 탁도 제거율 및 인 제거율을 나타내었다. 응집제의 주입량이 증가함에 따라 탁도는 급격하게 감소하는 경향을 보였으며, 인의 경우에는 금속이온과의 당량적 결합에 기인하여 비례적으로 감소하였다. 고속카메라(Motion Scope 2000, Redlake Co.)를 이용하여 플럭의 생성과정을 가시화하였고 광학현미경을 통해서 플럭의 성상과 형태를 고찰하였다. Fe(III)계 응집제에 의해 생성된 플럭들은 Al(III)계 응집제에 의해 생성된 플럭들에 비해 치밀하였으며 침강성도 뛰어났다.

Keywords

References

  1. K. Kemira, Handbook on Water Treatment, Helsinborg, Sweden ( 1993)
  2. W. Stumm and J. J. Morgan, Aquatic Chemistry, 3rd ed. New York, John Willey & Sons (1996)
  3. J. W. Kwak, Physico-Chemical Principle and Practice of Water Treatment, Yeigegak (1998)
  4. A. Amirtharajah and C. R. O'Melia, Coagulation Process: Destavilization, Mixing, and Flocculation, Water Quality and Treatment (4th ed.), AWWA., McGraw-Hill Inc. (1990)
  5. S. W. Lee, K. S. Lee, and J. W. Kwak, J. Korean Soc. on Water Quality, 18, 19 (2002)
  6. J. Vymazal, Algae and Element Cycling in Wetlands, ed. Lewis, Publisher (1995)
  7. M. Petrovic and M. Kastelan-Macan, Water Sci. Technol., 34, 253 (1996)
  8. J. Boisvert, T. C. To, A. Berrak, and C. Jolicoeur, Water Research, 31, 1939 (1997) https://doi.org/10.1016/S0043-1354(97)00042-0
  9. G. A. Edzwald and A. Amirtharajah. J Am. Water Works Assoc., 77, 50 (1985)
  10. J. W. Kwak and L. Gillberg, Asia-Pacific Regional Conference (6th IAWQ), Seoul (1997)
  11. R. L. Drose, Theory and Practice of Water and Wastewater Treatment, John Wiley & Sons (1997)
  12. P. Hsu, Water Research, 10, 903 (1976) https://doi.org/10.1016/0043-1354(76)90026-9
  13. S. W. Lee and J. W. Kwak, Kyungwon Periodicals, 15, 399 (1996)
  14. S. W. Lee, J. H. Jang, and J. W. Kwak, Asia-Pacific Regional Conference (6th IAWQ), Seoul (1997)
  15. S. W. Lee, K. S. Lee, J. Y. Heo, and J. W. Kwak, J. Korean Soc. of Environ. Eng., 22, 1495 (2001)